Microsoft, Chipotle rise; Activision, Old Dominion fall

Chipotle's stock dropped sharply after the company announced it would be closing its restaurants for several hours to train its employees on food safety.

Software maker's financial results for the first quarter beat Wall Street expectations.

The Mexican restaurant chain easily beat analyst's first-quarter profits forecasts.

The company's first-quarter revenue and earnings were weak.

Natural Resources Company abandoned plans to split into two companies